Wrench.



D. O. BRUNNER.

WRENCH.

APPLICATION FILED SEPT-20,1915.

Patentefl Apr. 25,1916.

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A TTOR/VEVS Damion O. Brunn K.

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WRENCH.

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Application filed September 20, 1915.

'1 '0 all whom it may concern:

Be it known that I, DANTON U. BRUN- xnn, a citizen of the'United States, and a resident of Spokane, in the county of Spokane and State of Washington, have invented a new and Improved Wrench, of which the following is a full, clear, and exact description.

My invention relates to wrenches embodying a sliding and a relatively fixed jaw.

An object of the invention is to provide a wrench of the indicated character in which approximate adjustment of the aws may be effected by a sliding movement, and in which an effective gripping action of the jaws on the work will be automatically effected by a bodily pivotal movement of the two jaws and the adjacent portions of the respective shanks.

My invention also has for its object to improve the wrench in various particulars, whereby to give it increased strength and to attain a quickness of adjustment with a positive gripping action either on a nut or on a pipe, or like round article.

The invention will be particularly explained in the specific description following.

Reference is had to the accompanying drawings forming part of this specification, in which similar characters of reference indicate corresponding parts in all the views, and in which Figure 1 is a side elevation of a wrench embodying my invention; Fig. 2 is a similar view, with parts broken away, in which the jaws and the adjacent portions of the shank are in the positions they assume in gripping an article; Fig. 3 is aback view of the wrench; and Fig. 4 is a crosssection.

In constructing a practical embodiment of my invention in accordance with the illustrated example, a shank is provided composed of a front section 10 and a rear section 11 pivotally united by a pin 12, or equivalent means. The front section 10 has a rigid jaw 13 and the rear section 11 has a suitable handle 14. In the example shown, the joint between the sections presentsga fork 15 on the rear section receiving a tenon 16 on the front section, the forkedi arm having a curved front edge struck the center of the pin 12, there being a shoiilder 17 at the base of the tenon 16 to limit the Specification of Letters Patent.

Patented Apr. 25, lttilti.

Serial No. 51,552.

pivotal movement of the sections in one direction, whereby to aline the same. A second shank is composed of a front section 18 and a rear section 19, the two being piv' otally united by a pin 20, or the like; The front section 18 is formed with a jaw 21, which jaw and the jaw 13 are preferably serrated for gripping a pipe A, or the like, Fig.2. The front section 18 is slidable on the front section 10, being provided with a loop 22 embracing the section 10. Similarly, the rear section 19 of the second shank is slidable on the rear section 11 of the first shank, being provided with a loop or yoke 23 embracing the said shank section 11. In the rear loop 23 operates a thumb screw 24, the head of which bears on the section 11, at the back, in a groove 25. On the opposed faces of the rear sections of the shanks are formed respectively mating teeth 26, 27. In practice, the threads of the screw have a coarse pitch, whereby a slight turn will serve to engage or disengage the teeth 26, 27.

By the described construction, the relative sliding movement of the shanks will serve to approximately adjust the jaws to a piece of work, after which the set screw 24: serves to lock the respective rear shank sections 11 and 19 rigidly with each other. With this position of the parts, in order to turn a piece of work such as a pipe A, or a nut, or the like, the first movement of the wrench handle will rock the respective front and rear sections on their pivots 12, 20, so that there will be a relative bodily movement of the respective jaws together with more or less of a tilting action thereof until the jaws automatically effect a firm grip on the work. The throw of the wrench handle in the opposite direction. releases the work for a new grlp.

Having thus described my invention, What I claim as new and desire to secure by Letters Patent, is:

1. A wrench comprising a shank, composed of pivotally connected front and rear 1 sections, the front section having a jaw and the rear section having a handle; and a second shank formed of pivotally united front and rear sections slidably fitting respectively on the front and rear sections of the first shank, the front section of the second shank having a jaw, the rear sections of said shanks having co-acting fastener elemerits to lock the same in fixed relation each other, the slidably engaged front sections being free to rock on their pivots regardless of the locked engagement of the rear sections.

2. In a wrench, a shank composed of a front section having a jaw and a rear handled section pivotally attached to the front section; a second shank composed of a front section having a jaw, and a rear section pivotally connected with the front section; the front and rear sections of the second shank having lips to slidably embrace the front and rear sections of r the first shank; and a set screw in the rear of the lip on the second shank adapted to bind on the rear section of the first shank, the two rear sections having mating teeth on their opposed faces engageable by a movement of the set screw.-

3. A wrench comprising two shanks each having a jaw at the front end, eachshank being formed of pivotally connected front and rear sections for independent pivotal movement and the respective sections of one shan "eing slidable along the corresponding sections of the other shank, and means to hold the two rear shanks against sliding movement.

In testimony whereof I have subscribed my name to this specification in the presence of two subscribing witnesses.

DANTON O. BRUNNER.

Witnesses:

WILLIAM B. Low, HOWARD L. SEAGER. 

